And thomas



(No ls/Iodem.-` 2 Smets-smear W. 1.-". DURPBE E T. BGLBSTON. MBTALLURGIGAL .GAS PURNAGE.'

m1295988. Patented Apr. 1,1884l i UNITED STATES PATENT EEICE.

WILLIAM E. DUEEEE, OE EEIDGEPOET, OONNEoTIOUT, AND THOMAS EGLEsrON, OE NEw YORK, N. Y.

M ETALLURGICAL GAS-Pommes.`

SPECIFICATION forming part of Letters Patent N o. 295,988, dated April 1, 1884.

Application filed June 27, 1882. Renewed March 6, 1884. (No model T all whom it may concern,.-

Beit known that we, WILLIAM F. DUEEEE and THoMAs EeLEsrON, citizens of the United States, residing, respectively, at Bridgeport, in the county of Fairfield and State of Connecticut, and at New York city, in the county of4 New York and State of New York, have invented a new and useful Improvement in Metallurgical Gas-Furnaces, of which the following is a specification.

Our invention relates to improvements in metallurgical furnaces in which gas is used as a fuel, and is intended to facilitate the introduction and equable distribution of air, steam, or other vapor or` gas to and in the heating or melting chamber of the furnace at certain stages of the operation, being conducted therein when such au introduction and distribution are desirable. Ve attain this result by means of apparatus illustrated in the accompanying drawings, in whichj Figure l is a vertical longitudinal section (on line C D of Fig. 2) of a metallurgical furnace (in which gaseous fuel is used) with our improvement attached, Fig. 2 is a horizontal section of Fig. l on line A B. I Fig. 3 is a transverse section of the furnace on line F G of Fig. 2. Fig. 4 is a detached View of one of the cold-air pipes shown at E'E in Figs. l and 2. Fig. 5 is a cross-section through the valve at the end of cold-air pipes and shows the valve open. I i

Similar letters refer to like parts in the several figures.

The manner of operating our invention is as follows, viz: XVhen in the course of the treament of the metal or other substance in the heating-chamber of the furnace it is desired to rapidly reduce the temperature ofthe furnace, or to rapidly oxidize, or to produce other chemical changes in the material under treatment, the valves V V in the end of the cold-air pipes EE are opened and the chimney-damper of the furnace is raised, so as to draw the cold air into the heatingchamber through said pipes E E, and theirattached nozzles a ot n, Sto., and the air-ducts ct et a and a a u. `located in the brick-work of the furnace between the ports7 or flues through which the hot air and gas enter the heatingchamber,` as is shown `in Figs. 1, 2, and 3. The cold-air pipes E E are provided with'a large nozzle, N, through which air, steam, or other vapor or gas may be introduced to the pipes, and thence through the channels a a Vnels a ct and the interior of the furnace can be easily examined and any obstruction in the channels removed. The spy-holes aforesaid are' glazed with mica, which is held in an iron frame pivoted on one side, so that it can be 7o turned aside in order to permit a rod to be inserted through the spy-holes into theV channels a a', -in order to remove any obstruction therefrom.

We are aware that prior to our invention openings for the introduction of air into the heating-chambers of. reverberatory furnaces using solid fuel have been made through the `bridge-wall andthrough the roof and side wall in the vicinity of the heating-chambers 8o of such furnaces, and that theseopenings have been intended to convey air only for the purpose of promoting the combustion of such combustive vapors as had escaped from the fire-box in an unconsumed state; and therefore we do not claim the use of our invention in connection with such fire-boxreverberatory furnaces, or for the purpose for which similar openings have been used in such fur-` naces; but v What we do claim as our invention, and desire to secure by Letters Patent, is

1. In a metallurgical furnace having gas and air ducts communicating with the heating-chamber, the pipes E E', provided with 95 nozzles N ot u, forthe purpose of introducing air, steam, or other vapor or gas to said furnace, substantially as described.

2. In a metallurgical furnace, the pipes E E', having valves V Y', nozzles N n n, and roo' spy-holes s s, substantially as and for the purpose described.

W. F. DURFEE. THOS. EGLESTON. 

